English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/4952
Compartir / Impacto:
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL

Effect of Nanosilica Additions on Belite Cement Pastes Held in Sulfate Solutions

AutorDolado, J. S.; Campillo, Igor; Erkizia, Edurne; Ibáñez, Jose A.; Porro Gutiérrez, Antonio; Guerrero Bustos, Ana María; Goñi Elizalde, Sara
Fecha de publicación2007
EditorAmerican Ceramic Society
John Wiley & Sons
CitaciónJ. Am. Ceram. Soc., 90(12): 3973–3976 (2007)
ResumenFly Ash Belite Cement (FABC) pastes with and without nanosilica additions have been prepared and maintained in sulfate solutions (Na2SO4 0.5M) for 180 days. The mechanical performance and the changes in microstructure have been monitored at 28, 90, and 180 days by compressive strength, X-ray diffraction (XRD), and 29Si MAS NMR measurements. We have found that, unexpectedly, and contrary to what happens in Ordinary Portland Cements (OPC), the addition of nanosilica particles induces an initial decline in the compressive strength of the samples. Only in samples maintained for a long time (180 days) does the nanosilica addition improve the mechanical properties. Our XRD and 29Si NMR experiments have revealed that although nanosilica additions trigger the consumption of Belite phases, this is not always accompanied by formation of longer calcium–silicate–hydrate (C–S–H) gel structures. Only at a long time (180 days), and due to a mechanism that seems to be controlled by the pH of the samples, do the nanosilica additions lead to high-polymerized C–S–H gels.
Descripción4 pages.-- Final full-text version of the paper available at: http://dx.doi.org/10.1111/j.1551-2916.2007.02034.x.
Aparece en las colecciones: (IETCC) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
JACERS-07-LABEIN-DURA-uv.pdf292,2 kBAdobe PDFVista previa
Mostrar el registro completo

Artículos relacionados:

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.